What is ISD asked Charlie Brown

1
What is ISD? asked Charlie Brown
Let me explain, said Linus. You could say its
this tree.
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You have to make sure to jam it full of good
stuff, to make it the best it can be.
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Then you pound away at the thing until you get
to the good stuff!
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You might get frustrated along the way
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But when youre all done designing, you can sit
back and relax with your buddy.
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And know that in the end, you made a good
product for all to enjoy.